About Multi-Floor Duct Systems in Referenced Drawings

You can connect duct systems in a current drawing with duct systems in referenced drawings. For example, a design for a multi-floor building includes a rooftop air conditioning unit. A medium velocity supply air duct runs vertically from the bottom of the AC unit to the ground floor. You can connect a system for each floor with the vertical supply air trunk even if the trunk exists in a reference drawing. The fittings needed to connect the floor system with the trunk are automatically saved in the reference drawing.

Remember: For more information, see Connecting Ducts Through Referenced Drawings.

Attention: You can connect to objects in an xref, but any modifications to connected objects in the current drawing will not be propagated through to the xref drawing. For example, a duct run in the current drawing is connected to duct in an xref drawing. If you modify the duct size in the current drawing, only the duct in the current drawing is modified.

The following example shows a simple duct systems on separate floors connected to a vertical trunk in a reference drawing.

This example shows takeoffs that are added to connect with the duct systems on each floor in the referenced drawing.